Solve the system of equations using any method.
4x + 15y = 344
x - 13y = -316
2007-07-12 08:22:05 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
x - 13y = -316 -> -4x + 52y = 1264
sys of eq is now:
4x + 15y = 344
-4x + 52y = 1264
add them up:
67y = 1608
y = 24
x - 13y = -316
x = -316 + 13y = -316 + 13*24 = -4
2007-07-12 08:38:14 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Check the system? It should be -15y (or +13y) and y = 24 and x = - 4
2007-07-12 08:42:57 · answer #2 · answered by bikstorm 2 · 0⤊ 0⤋
4x + 15y = 344
- 4x + 52y = 1264----ADD
67 y = 1608
y = 24
x - 312 = - 316
x = - 4
Answer is x = - 4 , y = 24
2007-07-12 10:13:25 · answer #3 · answered by Como 7 · 0⤊ 0⤋
well i won't give you the exact answer but i will do a similar one...
5x + 20y = 100
x + 5y = 50
take one equation and solve for one of the variables. i chose to solve for 'x' in the first one.
5x = 100 - 20y
x = 20 - 4y
now plug that value in for x into the second equation and solve for y.
x + 5y = 50
20 - 4y + 5y = 50
20 + y = 50
y = 30
now go back and plug y into either of the first 2 equations to get the answer for x.
x + 5y = 50
x + 5(30) = 50
x + 150 = 50
x = -100
solution:
x = -100
y = 30
now apply this technique with your equations.
2007-07-12 08:41:00 · answer #4 · answered by David D 1 · 0⤊ 0⤋